CN108709509B - Contour camera, matched oversized-diameter revolving body workpiece non-contact caliper and non-contact revolving body measuring method - Google Patents
Contour camera, matched oversized-diameter revolving body workpiece non-contact caliper and non-contact revolving body measuring method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
- G01B11/10—Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving
- G01B11/105—Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving using photoelectric detection means
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Abstract
The invention relates to the field of high-precision non-contact measurement, in particular to a profile camera arranged on a sensor, a matched non-contact caliper for a oversized-diameter revolving body workpiece and a non-contact revolving body measurement method. The method aims at solving the problems of low measurement precision, low measurement speed and poor stability of measurement equipment in the existing non-contact measurement technology. The sensor comprises a parallel light source generator, a contour camera and a control processor, wherein the parallel light source generator is arranged in a shell, the contour camera is arranged on the shell, the control processor is used for carrying out photoelectric signal conversion, and the output end of the contour camera is connected with an image processor and a display to realize data processing and display of the surface contour of a tested workpiece; the plane light beam emitted by the parallel light source generator intersects with the cylindrical surface of the workpiece to form a high-brightness arc line. The advantages are that: the measuring result is accurate, and meanwhile, the inclination and position errors of the workpiece in the measuring area can be eliminated, so that the accurate and rapid measurement of the outer diameter of the large-diameter workpiece is realized.
Description
Technical Field
The invention relates to the field of high-precision non-contact workpiece measurement, in particular to a contour camera, a matched ultra-large diameter revolving body workpiece non-contact caliper and a non-contact revolving body measurement method.
Background
The non-contact measurement refers to accurate measurement on the premise of not contacting the measured object, and the measurement precision can reach the mu m level. The non-contact calliper uses CCD to collect the outline image of the measured object, and then cooperates with the moving platform, and uses the image analysis principle to process the image signal by the computer, to measure the precise geometric dimension of the scientific research production part, and to analyze CPK value. In the field of industrial manufacturing, the non-contact diameter measurement of a plurality of large-scale rotary body workpieces, such as large-diameter pipes with heat insulation layers, large-diameter rubber rollers, large-diameter silicon rods, optical fiber mother rods and the like, is related.
Currently, non-contact measurement of these workpieces generally uses a correlation laser scanning method and a laser displacement sensor method. The skilled person has found that these detection methods have the following problems:
the correlation laser scanning method uses two groups of laser scanners and receivers, the volume is larger, and when the workpiece moves along the axial direction, the supporting frame of the workpiece can shield the laser scanning beam or collide with the scanners;
the laser displacement sensor method is that two opposite sensors respectively measure the distance of the surface of a workpiece, when the axis of the sensor is not coincident with the diameter line of the workpiece, a large measurement error can be generated, if the error is reduced, the sensor needs to perform accurate mechanical tracking movement, and the measurement speed is greatly reduced.
Disclosure of Invention
The invention aims to solve various problems in the prior art and provides a profile camera, a matched ultra-large diameter revolving body workpiece non-contact caliper and a non-contact revolving body measuring method.
The specific scheme of the invention is as follows:
the contour camera comprises a parallel light source generator, a contour camera and a control processor, wherein the parallel light source generator is arranged in a shell, the contour camera is arranged on the shell, the control processor is used for carrying out photoelectric signal conversion, the contour camera comprises an imaging lens group and an image sensor, the imaging lens group is arranged on the shell, the input end of the control processor is connected with the image sensor, and the output end of the control processor is connected with the image processor and a display to realize data processing and display of the surface contour of a workpiece to be tested; the plane light beam emitted by the parallel light source generator intersects with the cylindrical surface of the workpiece to form a high-brightness arc line, so that the arc line passes through the imaging lens group and is focused into a real image on the rectangular photosurface of the image sensor, a central line is arranged on the rectangular photosurface of the image sensor to serve as a measurement datum line, and the image sensor is in circuit connection with the control processor.
The optical axis of the imaging lens group is A line, and the A line is intersected with the central line of the light beam emitted by the parallel light source generatorAt the point S0 as a measurement reference point, the included angle between the line A and the central line of the light beam is theta 0 An included angle theta between the rectangular photosurface of the image sensor and the optical axis A of the imaging lens group 1 The intersection point of the optical axis of the imaging lens group and the rectangular photosurface of the image sensor is M0, the distance from M0 to the main surface of the imaging lens group is v0, the distance from the intersection point S0 of the optical axis of the imaging lens group and the central line of the laser beam to the main surface of the imaging lens group is u0, f is the focal length of the imaging lens group, and u0 and v0 satisfy the following conditions:thereby converting the high brightness arc line into an arc image on a rectangular photosurface of the image sensor, wherein the distance from a point with a distance h from an S0 point along the laser beam direction to an M0 point formed on the rectangular photosurface of the image sensor is MM0, and the distance is in the following functional relation with h: />To reflect the distance of each point of the high brightness arc to the reference point S0.
The parallel light source generator is provided with a light source brightness adjusting component.
The non-contact caliper for oversized-diameter revolving body workpieces is characterized in that a profile camera is arranged on the non-contact caliper, the non-contact caliper comprises a bracket and a moving device penetrating through the brackets at two sides, at least 2 sections of V-shaped fixing frames are arranged on the moving device, the measured revolving body workpieces are arranged on the V-shaped fixing frames, the top surface of each V-shaped fixing frame is a C surface, the maximum cross section of each revolving body workpiece parallel to the C surface is a B surface, in the vertical direction, the B surface is higher than the C surface, and the B surface is outside the field of view of the profile camera;
the sliding translation table is correspondingly arranged on two sides of the bracket, the profile camera is arranged on the sliding translation table, and a measuring element for measuring the distance between the profile camera and a designated fixed end is also arranged on the sliding translation table.
At least one profile camera is mounted on the sliding translation stage on each single side.
The sliding translation platform comprises a vertical lifting platform which is slidably mounted on the support in the vertical direction, a telescopic sliding table is slidably mounted on the vertical lifting platform along the horizontal direction, the profile camera is mounted at the other end of the telescopic sliding table, power sources are respectively arranged between the support and the vertical lifting platform and between the vertical lifting platform and the telescopic sliding table to drive a movable pair to be connected, the outer side edge of the support is used as a fixed end, and the measuring element comprises a grating measurer which is mounted on the telescopic sliding table to measure the distance between the profile camera and the fixed end.
The non-contact caliper is remotely connected with an image processor for processing images and calculating measurement data, and the output end of the image processor is connected with a display device for outputting measurement results.
The non-contact revolving body measuring method using the contour camera is characterized by comprising the following steps:
(1) And (2) mounting: symmetrically installing contour cameras on two sides of a displacement path of a measured workpiece, designating fixed ends on two sides, installing a distance measuring component for measuring the distance between the contour cameras and the fixed ends, and ensuring that the line height of the distance measuring component corresponds to the measuring area of the contour cameras and the moving range of a vertical lifting platform when the measured workpiece is installed;
(2) Distance measurement, in which the workpiece to be measured is moved at a speed of less than 5 km/hr relative to the contour camera, the contour cameras on both sides measure distances G1, G2 between the workpiece to be measured and the contour camera while the workpiece to be measured is moved, the distance measuring means measures distances L1, L2 between the contour camera and the fixed ends, the distance between the fixed ends on both sides is D0, and the diameter of the workpiece to be measured is measured
D=(D0-L1-L2-G1-G2)。
Symmetrically installing two pairs of profile cameras on two sides of a displacement path of a measured workpiece, wherein the distance between each pair of profile cameras is L0, L0 is larger than 10mm, and correspondingly, the step (3) is added after the step (2) to calculate the compensation diameter:
firstly, calculating the inclination angle of the actual axis of the workpiece and the X axis in the horizontal direction: the distances between the distances L11 and L12 between the profile camera and the fixed end and the distances G11 and G12 between the other pair of distances L21 and L22 between the profile camera and the fixed end and the distances G21 and G22 between the other pair of distances between the profile camera and the fixed end and the measured workpiece,
the offset angle is obtained, and the offset angle is obtained,single pair profile camera measurement diameter D1=D0-L11-L12-G11-G12, D2=D0-L21-L22-G21-G22
Taking the average value of D1 and D2 and compensating the inclination influence of the workpiece to obtain the diameter:
D=（D1+D2）/2*COSθ。
the invention has the beneficial effects that:
the design of the sensor avoids scattered light sources, replaces the scattered light sources with parallel light sources, and detects the nearest light output by the parallel light sources to determine the distance, so that the accuracy is high;
the laser parallel light source emits uniform linear laser beams, and compared with the laser beams of the diffusion light source, the laser parallel light source has more uniform illumination and better imaging quality. The laser beam emitted by the laser parallel light source forms a plane vertical to the horizontal plane, the laser beam is tangent to the cylindrical surface of the measured workpiece to form a bright contour curve, the contour curve passes through the imaging lens group, and a real image is formed on the image plane of the image sensor deflected by a certain angle with the optical axis of the imaging lens group. Each image point of the real image corresponds to each point of the contour curve of the workpiece one by one, and the position of the image point on the image sensor reflects the distance between each point of the contour curve of the corresponding workpiece and the reference surface of the non-contact sensor;
meanwhile, the measuring system solves the problem of non-contact measurement of the outer diameter of the large-diameter revolving body workpiece, eliminates the problem that the center line of the one-dimensional distance sensor is not coincident with the diameter line of the workpiece, eliminates measurement errors caused by the inclination of the workpiece, and particularly realizes the rapid and accurate continuous outer diameter measurement of the oversized-diameter revolving body workpiece by the non-contact caliper of the oversized-diameter revolving body workpiece;
the V-shaped supporting frame is fixed on the workpiece in a multi-point fixing mode, the workpiece fixing effect is good, the assembly size of the V-shaped supporting frame ensures that the diameter of the workpiece is measured, the measurement is accurate, and meanwhile, the V-shaped supporting frame is made of a material with certain elasticity, so that the influence of collision on the surface accuracy of the workpiece can be prevented
The automatic measuring device is connected with the control system, automation of a measuring mode can be achieved through a built-in program of the control system, in the measuring process, a workpiece is placed on a running vehicle and passes through the support, measuring results can be visually seen on the display screen, and labor is saved.
Drawings
FIG. 1 is a top view of a contour camera configuration;
FIG. 2 is a side view of a contour camera configuration;
FIG. 3 is a schematic diagram of the principle of contour camera imaging;
FIG. 4 is a schematic diagram of the principle of contour camera measurement;
fig. 5 is a front view of the contour camera projected on the photosensitive surface of the image sensor in the state shown in fig. 4;
FIG. 6 is a perspective view of the overall structure of the caliper of the present invention;
FIG. 7 is a front view of the overall structure of the caliper of the present invention;
FIG. 8 is a left side view of the overall structure of the caliper of the present invention;
FIG. 9 is a top view of the overall structure of the caliper of the present invention;
FIG. 10 is a schematic diagram of the measurement process of the present invention;
FIG. 11 is a schematic illustration of the measurement process in another state of the invention;
the mobile device is omitted from fig. 6;
the names of the components in the figure are as follows: 1. a workpiece to be measured; 2. a bracket; 3. a V-shaped fixing frame; 4. a mobile device; 5. a contour camera; 6. a vertical lifting platform; 7. a telescopic sliding table; 8. a camera frame; 9. a control processor; 10. a parallel light source generator; 11. a recording distance measuring mechanism; 12. a parallel light source; 13. an image lens group; 14. a housing; 15. an image sensor; 16. an image display.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Referring to fig. 1 to 11, the profile camera comprises a parallel light source generator 10 installed in a shell, a profile camera installed on the shell and a control processor for photoelectric signal conversion, wherein the profile camera comprises an imaging lens group 13 and an image sensor 15 which are installed on a shell 14, the input end of the control processor is connected with the image sensor 15, and the output end of the control processor is connected with the image processor and a display to realize data processing and display of the surface profile of a tested workpiece; the plane light beam emitted by the parallel light source generator intersects with the cylindrical surface of the workpiece to form a high-brightness arc line, so that the arc line passes through the imaging lens group and is focused into a real image on the rectangular photosurface of the image sensor, a central line is arranged on the rectangular photosurface of the image sensor and is used as a measurement datum line, and the image sensor is connected with the control processor circuit.
The optical axis of the imaging lens group is A line, the A line of the optical axis of the imaging lens group intersects with the central line 12 of the light beam emitted by the parallel light source generator at the S0 point which is taken as the reference point of measurement, and the included angle between the A line and the central line 12 of the light beam is theta 0 Included angle θ between rectangular photosurface 15 of image sensor and optical axis a of imaging lens group 1 The intersection point of the optical axis of the imaging lens group and the rectangular photosurface of the image sensor is M0, the distance from M0 to the main surface of the imaging lens group is v0, the distance from the intersection point S0 of the optical axis of the imaging lens group and the central line of the laser beam to the main surface of the imaging lens group is u0, f is the focal length of the imaging lens group, and u0 and v0 satisfy the following conditions:thereby converting the high brightness arc line into an arc image on a rectangular photosurface of the image sensor, wherein the distance from a point with a distance h from an S0 point along the laser beam direction to an M0 point formed on the rectangular photosurface of the image sensor is MM0, and the distance is in the following functional relation with h: />To reflect the distance from each point of the high brightness arc to the reference point S0
The parallel light source generator is provided with a light source brightness adjusting component.
A non-contact caliper for oversized-diameter revolving body workpieces is arranged on the non-contact caliper, and comprises a bracket 2 and a moving device 4 penetrating through the brackets 2 on two sides, wherein at least 2 sections of V-shaped fixing frames 3 are arranged on the moving device 4, the measured revolving body workpieces are arranged on the V-shaped fixing frames 3, the top surface of each V-shaped fixing frame 3 is a C surface, the maximum cross section of each revolving body workpiece parallel to the C surface is a B surface, in the vertical direction, the B surface is higher than the C surface, and the B surface is outside the field of view of the profile camera;
the sliding translation table is correspondingly arranged on two sides of the bracket 2, the profile camera 5 is arranged on the sliding translation table, and the sliding translation table is also provided with a measuring element for measuring the distance between the profile camera 5 and a designated fixed end.
At least one profile camera 5 is mounted on each single-sided sliding translation stage.
The sliding translation platform comprises a vertical lifting platform 6 which is arranged on the support 2 in a sliding manner in the vertical direction, a telescopic sliding table 7 is arranged on the vertical lifting platform 6 in a sliding manner along the horizontal direction, the profile camera 5 is arranged at the other end of the telescopic sliding table 7, power sources are respectively arranged between the support 2 and the vertical lifting platform 6 and between the vertical lifting platform 6 and the telescopic sliding table 7 so as to drive the movable pair to be connected, the outer side edge of the support 2 is used as a fixed end, and the measuring element comprises a grating measurer which is arranged on the telescopic sliding table 7 so as to measure the distance between the profile camera 5 and the fixed end.
The non-contact caliper is remotely connected with an image processor for processing images and calculating measurement data, and the output end of the image processor is connected with a display device for outputting measurement results.
The non-contact revolving body measurement method using the contour camera 5 is characterized by comprising the following steps:
(1) And (2) mounting: symmetrically installing profile cameras 5 on two sides of a displacement path of a measured workpiece 1, simultaneously designating fixed ends on two sides, installing a ranging component for measuring the distance between the profile cameras 5 and the fixed ends, and ensuring that the line height corresponds to the measuring area of the profile cameras 5 and the moving range of a vertical lifting platform 6 when the measured workpiece 1 is installed;
(2) Distance measurement, in which the workpiece 1 is moved at a speed of less than 5 km/hr relative to the contour camera 5, the contour cameras 5 on both sides measure distances G1, G2 between the workpiece 1 and the workpiece 1 while the workpiece 1 is moved, the distance measuring means measures distances L1, L2 between the contour camera 5 and the fixed ends, the distance between the fixed ends on both sides is D0, and the diameter of the workpiece 1 is measured
D=(D0-L1-L2-G1-G2)。
Symmetrically installing two pairs of profile cameras 5 on two sides of the displacement path of the measured workpiece 1, wherein the distance between each pair of profile cameras 5 is L0, L0 is larger than 10mm, and correspondingly, the step (3) is added to calculate the compensation diameter after the step (2):
firstly, calculating the inclination angle of the actual axis of the workpiece and the X axis in the horizontal direction: the distances between the distances L11, L12 between the pair of profile cameras 5 and the fixed end and the distances G11, G12 between the other pair of profile cameras 5 and the fixed end and the distances G21, G22 between the other pair of profile cameras 5 and the fixed end and the measured workpiece 1,
the offset angle is obtained, and the offset angle is obtained,，，
the single pair of profile cameras 5 measure diameters d1=d0-L11-L12-G11-G12, d2=d0-L21-L22-G21-G22
Taking the average value of D1 and D2 and compensating the inclination influence of the workpiece to obtain the diameter:
D=（D1+D2）/2*COSθ。
during operation, the distance that the image of the arc deviates from the measurement datum reflects the distance of the workpiece surface from the profile camera.
At least two profile cameras 5 are mounted on each single-sided sliding translation stage. To accommodate the condition of the inclination of the workpiece 1 being measured.
The V-shaped fixing frame 3 is polygonal frustum pyramid-shaped, the thickness of the V-shaped fixing frame is smaller than 50cm, the upper surface of the V-shaped fixing frame comprises symmetrically arranged inclined planes, and the V-shaped fixing frame is made of rubber. The surface precision abrasion caused by collision can be effectively prevented. Cork may also be substituted for specific work.
The non-contact caliper is remotely connected with a controller for inputting measurement data, and the output end of the controller is connected with a display device for outputting measurement results. Further saving the manpower.
The determination and compensation of the inclination angle mainly takes into account the inclination with respect to the horizontal plane, since the measurement result is not affected as long as it is within the range of travel measured with respect to the inclination in the vertical direction.
In the working process, after the measured workpiece 1 is positioned and fixed, the size of the measured workpiece 1 is directly obtained through the combination measurement of the sensor and other equipment in the process of the bracket 2, the measurement precision is high, and meanwhile, the collision of parts can not occur in the measurement process, namely, the workpiece itself can not be worn due to the measurement.
Example 2: the principle of this embodiment is the same as that of embodiment 1, and the specific difference is that: the profile camera and the measuring method thereof can be applied to the field of measuring the side of the turning part, the parallel light source projects onto the columnar surface of the workpiece, and the profile camera measures whether the outer diameter of the turned workpiece is qualified or not.
Example 3: the principle of this embodiment is the same as that of embodiment 1, and the specific difference is that: the condition that the measured workpiece is not moved and the measuring frame is moved can also be adopted during measurement.
Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that the present invention is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A contour camera mounted on a sensor, characterized by: the profile camera comprises a parallel light source generator (10) arranged in a shell, a profile camera arranged on the shell and a control processor for photoelectric signal conversion, wherein the profile camera comprises an imaging lens group (13) and an image sensor (15) which are arranged on the shell (14), the input end of the control processor is connected with the image sensor (15), and the output end of the control processor is connected with the image processor and a display to realize data processing and display of the surface profile of a workpiece to be tested; the plane light beam emitted by the parallel light source generator (10) intersects with the cylindrical surface of the workpiece to form a high-brightness arc line, so that the arc line passes through the imaging lens group, a real image is focused on the rectangular photosurface of the image sensor, a central line is arranged on the rectangular photosurface of the image sensor to serve as a measurement datum line, the image sensor is in circuit connection with the control processor, the optical axis of the imaging lens group is an A line, the A line intersects with the central line (12) of the light beam emitted by the parallel light source generator at a point S0 serving as a measurement datum point, an included angle between the A line and the central line (12) of the light beam is theta 0, an included angle theta 1 between the rectangular photosurface of the image sensor (15) and the optical axis A of the imaging lens group is M0, the distance from the intersection point of the optical axis of the imaging lens group and the rectangular photosurface of the imaging lens group to the main surface of the imaging lens group is v0, the distance from the intersection point S0 of the optical axis of the imaging lens group and the central line of the laser beam to the main surface of the imaging lens group is u0, and f is the focal length of the imaging lens group is 0, and v0 is satisfied:
thereby converting the high brightness arc line into an arc image on a rectangular photosurface of the image sensor, wherein the distance from a point with a distance h from an S0 point along the laser beam direction to an M0 point formed on the rectangular photosurface of the image sensor is MM0, and the distance is in the following functional relation with h: />To reflect the distance of each point of the high brightness arc to the reference point S0.
2. The sensor-mounted profile camera of claim 1, wherein: the parallel light source generator is provided with a light source brightness adjusting component.
3. A non-contact calliper for oversized rotary workpieces, on which is mounted a profile camera as defined in claim 1, characterized in that: the device comprises a bracket (2) and a moving device (4) penetrating through the brackets (2) at two sides, wherein at least 2 sections of V-shaped fixing frames (3) are arranged on the moving device (4), a measured revolving body workpiece is arranged on the V-shaped fixing frames (3), the top surface of the V-shaped fixing frames (3) is a C surface, the maximum cross section of the revolving body workpiece parallel to the C surface is a B surface, in the vertical direction, the B surface is higher than the C surface, and the B surface is outside the field of view of a contour camera;
the sliding translation table is correspondingly arranged on two sides of the bracket (2), the profile camera (5) is arranged on the sliding translation table, and a measuring element for measuring the distance between the profile camera (5) and a designated fixed end is also arranged on the sliding translation table.
4. The oversized rotary workpiece non-contact calliper of claim 3, wherein: at least one profile camera (5) is mounted on the sliding translation stage on each single side.
5. The oversized-diameter rotary workpiece non-contact calliper of claim 4, wherein: the sliding translation platform comprises a vertical lifting platform (6) which is slidably mounted on the support (2) in the vertical direction, a telescopic sliding table (7) is slidably mounted on the vertical lifting platform (6) along the horizontal direction, the profile camera (5) is mounted at the other end of the telescopic sliding table (7), a power source is respectively arranged between the support (2) and the vertical lifting platform (6) and between the vertical lifting platform (6) and the telescopic sliding table (7) so as to drive a movable pair to be connected, the outer side edge of the support (2) is used as a fixed end, and the measuring element comprises a grating measurer which is mounted on the telescopic sliding table (7) so as to measure the distance between the profile camera (5) and the fixed end.
6. The oversized-diameter rotary workpiece non-contact calliper of claim 4, wherein: the non-contact caliper is remotely connected with an image processor for processing images and calculating measurement data, and the output end of the image processor is connected with a display device for outputting measurement results.
7. A non-contact rotation body measuring method using the contour camera according to claim 1, characterized by comprising the steps of:
and (2) mounting: symmetrically installing profile cameras (5) on two sides of a displacement path of a measured workpiece (1), designating fixed ends on two sides, installing a distance measuring component for measuring the distance between the profile cameras (5) and the fixed ends, and ensuring that the line height of the measured workpiece (1) corresponds to the measuring area of the profile cameras (5) and the moving range of a vertical lifting platform (6) when the measured workpiece (1) is installed;
distance measurement, in which the workpiece (1) to be measured is moved at a speed of less than 5 km/hour relative to the contour camera (5), the contour cameras (5) on both sides measure distances G1, G2 between the workpiece (1) to be measured and the contour camera (5), the distance measuring means measures distances L1, L2 between the contour camera (5) and the fixed ends, the distance between the fixed ends on both sides is D0, and the diameter of the workpiece (1) to be measured is measured
D=(D0-L1-L2-G1-G2)。
8. The non-contact rotary body measuring method according to claim 7, characterized in that: two pairs of profile cameras (5) are symmetrically arranged on two sides of a displacement path of a measured workpiece (1), the distance between each pair of profile cameras (5) is L0, L0 is larger than 10mm, and the compensation diameter is calculated by adding the step (3) after the step (2):
step (3), firstly calculating the inclination angle of the actual axis of the workpiece and the X axis in the horizontal direction: the distances G11, G12 between the distances L11, L12 between the pair of profile cameras (5) and the fixed end and the measured workpiece (1), the distances L21, L22 between the other pair of profile cameras (5) and the fixed end and the distances G21, G22 between the other pair of profile cameras and the measured workpiece (1),
the offset angle is obtained, and the offset angle is obtained,the single pair of profile cameras (5) measure diameters d1=d0-L11-L12-G11-G12, d2=d0-L21-L22-G21-G22
Taking the average value of D1 and D2 and compensating the inclination influence of the workpiece to obtain the diameter:
D=（D1+D2）/2*COSθ。
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